the 10 guage wire would connect to the "yellow" lead....which acts as your constant. The only way the stereo would be kept on was if you hooked the red lead up to the one that went directly to the battery. I went ahead and did the bigger wire, and just ran it from my distribution block in the trunk and i'll tell you that on the stock bose speakers in front, and some pioneer 6 1/2's with the correct tuning that internal amp does extremely well for what you pay for it. LaterZ